Reversal of coherently controlled ultrafast photocurrents by band mixing in undoped GaAs quantum wells.
Reversal of coherently controlled ultrafast photocurrents by band mixing in undoped GaAs quantum wells.
复制标题
通过未掺杂 GaAs 量子阱中的能带混合反转相干控制的超快光电流。
DOI：
10.1103/physrevlett.104.217401
复制
发表时间：
2010
影响因子：
8.6
通讯作者：
T. Meier
中科院分区：
文献类型：
--
作者：
S. Priyadarshi;A. Racu;K. Pierz;U. Siegner;M. Bieler;H. T. Duc;J. Förstner;T. Meier
结果表明，GaAs量子阱威尔斯中的价带混合极大地改变了电子输运。采用飞秒激光脉冲激发超快电流注入未掺杂GaAs量子威尔斯的相干控制方案。观察到的注入电流的振幅和方向上的激发光子能量的振荡依赖性。微观理论分析表明，这种电流反转是由轻空穴和重空穴带的耦合引起的，空穴电流主导了整个电流响应。带混合的这些令人惊讶的结果照亮了基础物理学，因为它们对于能够监测具有相对较大动量的载流子所产生的电子输运的实验是独特的。
It is demonstrated that valence-band mixing in GaAs quantum wells tremendously modifies electronic transport. A coherent control scheme in which ultrafast currents are optically injected into undoped GaAs quantum wells upon excitation with femtosecond laser pulses is employed. An oscillatory dependence of the injection current amplitude and direction on the excitation photon energy is observed. A microscopic theoretical analysis shows that this current reversal is caused by the coupling of the light- and heavy-hole bands and that the hole currents dominate the overall current response. These surprising consequences of band mixing illuminate fundamental physics as they are unique for experiments which are able to monitor electronic transport resulting from carriers with relatively large momenta.
半导体量子阱超快二色光激发产生的电荷和自旋电流的拉比翻转
影响因子：
2.1
作者：
B. Pasenow;H.T. Duc;T. Meier;S.W. Koch
通讯作者：
S.W. Koch